Social Networking, Blog Posting, Social Bookmarking, article submission, Forum Discussions, Comments Posting the best way is to build high quality backlinks and increase ranking.

http://www.cheapboxprinting.com/

Article Posting
Guest Posting
Blogging and Forum Posting you are already doing and one more thing increase your websites traffic because when your websites traffic count gets up then for sure ranking will be on top.

There is no problem with seo.
Only work on quality sites.check the site page rank and check also the Alexa.

I think it boils down to good content. Back links are very important also, but they need to be natural links, not a massive purchase of low quality links. Slowly building links combined with good quality content.

For improving the ranking of your website's keywords, the best way is to build high quality backlinks and submit fresh quality content.

By doing quality link building and get do-follow back links from high PR or authority sites.

The initial question was on the use of keywords.
When you use Wordpress as your CMS, you could use SEO (a plugin from Yoast).
It will assist and guide you.

the bets advice is to create good content, and promote it naturally. The links will follow. Submit articles to ezine, post on the forum, find dofollow blogs. Get a good pyramid of links going.

Get quality backlinks and update your website regularly.

Forum posting, social media ,article submission, blog posting helps to increase page rank.

Thanks for sharing........

loft conversion islington

loft conversion n15

Totally agree !!!

Try to use Google Adwords to check how competitive before deciding on it. Be sure that the keywords has enough searches. Try using broad key words too